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Hey, Yes - this is a classic problem. It should be relatively easy to fix in the hosting platform settings. What third party provider are you using?

My main SEO conference experience has been attending several SES and SMX events. I personally prefer the SMX events because I think they tend to have fresher topics, and it's a more comfortable conference to attend in that you have better food, more networking time between sessions, etc. SMX Advanced is good in that it's a somewhat smaller show, and has more advanced topics. I think some of it depends on your focus. A small, focused seminar like EGOL talks about may be just what you need, or you may want a conference with a wider variety of topics.

So, is a flat structure bad for SEO? I mean, it's the pages in the "bottom" of the site structure that are the most important ones... Sometimes it is and sometimes it isn't.  It depends upon a lot of factors, mostly the size of your site, your goals and the relative amounts of competition that your pages are up against. Anybody who gives you an answer here is guessing.  This is one of the most important strategy decisions that a webmaster can make and a good decision would require an evaluation of your site, keyword competitiveness research, plus information about your business. On top of that the ideal structure of your site can change over time as it becomes more powerful or as your competitors become more powerful.  New sites often do best with a narrow structure and then can go flatter and flatter as they gain power. It would be best to hire someone who really knows link structure and competitive analysis if you want a good evaluation of this.